Part subpixel edge detection method based on improved Zernike moment

To address the issue of inaccurate velocity measuremen, easy fatigue for long time measurement, low measurement accuracy, and difficult to realize measurement automation, a subpixel edge detection method with improved Zernike moment was introduced in this paper. Firstly, the pixel level edge detection algorithm is used for rough edge location. Secondly, a three-gray edge detection model as an enhanced alternative to the ideal edge model, enabling subsequent computation of edge characteristic parameters. Finally, the subpixel edge coordinates are calculated. The size detection algorithm has high measurement accuracy and greatly improves the detection efficiency